21324208 has 10 divisors (see below), whose sum is σ = 41315684. Its totient is φ = 10662096.

The previous prime is 21324203. The next prime is 21324221. The reversal of 21324208 is 80242312.

It is not an unprimeable number, because it can be changed into a prime (21324203) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 666366 + ... + 666397.

Almost surely, 2^21324208 is an apocalyptic number.

It is an amenable number.

21324208 is a deficient number, since it is larger than the sum of its proper divisors (19991476).

21324208 is a wasteful number, since it uses less digits than its factorization.

21324208 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1332771 (or 1332765 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 22.

The square root of 21324208 is about 4617.8142015460. The cubic root of 21324208 is about 277.3049593958.

The spelling of 21324208 in words is "twenty-one million, three hundred twenty-four thousand, two hundred eight".